chore(package): update semantic-release to version 15.0.0

Author: greenkeeper[bot]

package.json

@@ -90,7 +90,7 @@
     "nps": "^5.7.1",
     "nps-utils": "^1.3.0",
     "prettier": "^1.6.1",
-    "semantic-release": "^8.0.0",
+    "semantic-release": "^15.0.0",
     "source-list-map": "2.0.0",
     "superagent": "^3.6.0",
     "supertest": "^3.0.0",